Antenna Booster. What is antenna booster? A device used to amplify the signal received (by ratio) by...
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Transcript of Antenna Booster. What is antenna booster? A device used to amplify the signal received (by ratio) by...
What is antenna booster?What is antenna booster?
A device used to amplify the signal A device used to amplify the signal received (by ratio) by the antenna before received (by ratio) by the antenna before feeding to the television receiver.feeding to the television receiver.
A signal protection box that regulates A signal protection box that regulates television frequency signal.television frequency signal.
Booster Block DiagramBooster Block Diagram
Signal Detector
LoDetector
Receiver Input
DuplexerDirectional
coupler
Antenna input Re-transmit
Detecting ReceiversDetecting Receivers
• Allow secondary users in licensed bands if they can guarantee that they Allow secondary users in licensed bands if they can guarantee that they do not interfere with primary do not interfere with primary receiversreceivers..
Ch.5
Ch.7
Ch.6
Ch.4
Ch.3
Ch.5
Ch.9
Ch. 3,4,5,6,7
shadower
Detecting “Passive” ReceiversDetecting “Passive” Receivers
• Legacy receivers must be able to function interference free.Legacy receivers must be able to function interference free.• All RF receivers leak local oscillator out of antenna.All RF receivers leak local oscillator out of antenna.• Solution: Low cost sensors to detect leakage.Solution: Low cost sensors to detect leakage.
Reverse LO leakage
CognisensorCognisensor
• Optimal to connect sensor directly between receiver and antenna.Optimal to connect sensor directly between receiver and antenna.• Increases LO power coupled to sensor, reduces interference.Increases LO power coupled to sensor, reduces interference.• Allows sensor to reuse receive antenna for transmission.Allows sensor to reuse receive antenna for transmission.
cognisensor
Cognisensor, close up
Antenna input
Receiver Input
DirectionalCoupler
LODetector
Transmitter
Duplexer
CR
ANATOMY OF AN ANALOG TV SIGNALexample; channel 19
Lower Edge – 500.000 MHz
Upper Edge – 506.000 MHz
Video Carrier center freq –
501.250 MHz
Color Carrier center freq –
504.830 MHz
Audio Carrier center freq –
505.750 MHz
0 amplitude
ANATOMY OF A DIGITAL TV SIGNALexample; channel 19
Lower Edge – 500.000 MHz
Upper Edge – 506.000 MHz
Video, Color and Audio Carrier Signals Are Scattered Throughout the
Bandwidth at FULL Amplitude
0 amplitude
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KCSI
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X
P
E
R
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M
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N
T
A
L
KWHY
S
L
A
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E
D
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D
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KVCR-DT
KCET
KPXN
KTLA-DT
KDOC-DT
KSMV-LP
KMEX
KMEX-DT
KNBC-DT R
adio
Ast
rono
my K
NET-LP
KVEA-DT
KTBN
KLCS-DT
KWHY-DT
KCAL-DT
KXLA
KFTR
KFTR-DT
KOCE-DT
S
L
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D
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KOCE
KXLA-DT
KVEA
KABC-DT
KAZA-DT
KDOC
KJLA
KLCS
KCET-DT
KCBS-DT
KSCI-DT
KRCA
KTTV-DT
KCOP-DT
KRCA-DT
Equal Frequency allocation of UHF TV
in the UHF SPECTRUM
TV Booster Common ProblemsTV Booster Common Problems
No powerNo power Intermittent signalIntermittent signalLight bars rolling up or downLight bars rolling up or downFoggy picturesFoggy picturesWeak signalWeak signalPictures color on and offPictures color on and offSagging picturesSagging pictures